Katch Mcardle is a pretty decent one, if you know your BF%. I think there is one more I'd have to dig into my notes but with active/lean people Katch seems to be the best way to go. Most of them are over estimates tho so you gotta pay close attention to weight and the mirror. No matter what formula used its just a starting point and is up to you to get it just right according to YOU.
: ) hope that helps any other q's let me know.